Beverage coaster



FIG. 1 is a top perspective view of a beverage coaster showing my new design;

FIG. 2 is a rear end view thereof;

FIG. 3 is a front end view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side view thereof of FIG. 1; and

FIG. 6 is a right side view thereof of FIG. 1. 

The ornamental design for a beverage coaster, substantially as shown. 